Modified hydrodynamic model and its application in the investigation of laser-cluster interactions

By solving the Maxwell equations, an effective plasma dielectric constant is obtained to replace the quasistatic plasma dielectric constant derived from the Drude model. In the vicinity of resonance absorption, the electron density and temperature undergo such a rapid change that the quasistatic dielectric constant is no longer appropriate to describe the behavior of resonance absorption. Using this effective dielectric constant to modify the hydrodynamic model developed by Ditmire and co-workers, we studied the interaction between different-sized atomic clusters and high-intensity laser pulses of different wavelengths. Reasonable agreement between the calculated results and published experimental results was found.